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Type: This functrion identifies the echogram type in use.

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Upper Limit / Lower Limit: These parameters identify the depth range covered by the layer.

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sA: sA is the nautical area scattering coefficient. sA is commonly abbreviated as NASC. In this context the sA value presents the current biomass index.

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Sv: Sv is the volume backscattering strength. Sv is commonly abbreviated as VBS. The Sv value identifies the total volume backscatter in the depth layer.

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Number of targets: This information identifies the number of individual targets (single fish) in the depth layer.

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Max TS in ping ... at depth: These parameters identify the strongest target strength detected, and at which depth.

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Alongship angle / Athwartship angle: These parameters identify the alongship and athwartship offset angles for the transducer. These offset angles are taken from the calibration results.

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Max TS in interval ... at depth: These parameters identify the strongest target strength detected, and at which depth.

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Noise Spectrum: This information is only valid for FM transmissions. The value reflects an estimation of the noise level over the transducer bandwidth. This information is useful for identifying noise sources in both Passive and Active transmission modes.